Actual UK cover for The Eternity Code.
The code in the box reads, "think fairy, fairy again". In the bottom left and bottom right corners of this same box, there are two sequences of ciphers in a code which does not appear anywhere else in the series.
Another, similar design was also produced but not used - presumably because of the spelling mistake in the code. It says, "Artemis Fowl the Eterity Code".
